Authoritative definitions of the International System of Units and SI prefixes.
Unit converters
Radiation
Enter your values below for a clear, instant result.
Radiation unitsInstant result
Decimals
Formula result = input × 1 ÷ 0.001. 1 Gy = 1,000 mGy
Common examples
One value, several units
Milligray1,000 mGy
Rad100 rad
Joules per kilogram1 J/kg
Conversion table
| Gy | mGy |
|---|---|
| 1 Gy | 1,000 mGy |
| 2 Gy | 2,000 mGy |
| 5 Gy | 5,000 mGy |
| 10 Gy | 10,000 mGy |
| 25 Gy | 25,000 mGy |
| 50 Gy | 50,000 mGy |
| 100 Gy | 100,000 mGy |
Conversion chart
1 Gy1,000 mGy
5 Gy5,000 mGy
10 Gy10,000 mGy
25 Gy25,000 mGy
50 Gy50,000 mGy
Worked example
1 gray equals 100 rad.
Unit definition
Gray (Gy) One gray equals 1 gray.
Unit history
Gray is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert Gy to gray.
3. Convert the base value to mGy and apply your display precision.
Understand the result before using it
Radiation converts absorbed dose, equivalent dose, or radioactivity while preserving the selected radiation quantity. The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 1 ÷ 0.001
Assumptions
- The source and target selections represent the same physical quantity or supported notation.
- The entered value is valid for the selected relationship and uses the source unit shown.
- Published unit definitions and conventional conversion factors apply under their stated conditions.
Worked example
1 gray equals 100 rad.
When to use it
Good uses
- Translate a radiation value found in a document, specification, recipe, or measurement.
- Compare values reported in different unit systems.
- Check a manual conversion and control the displayed precision.
Limitations
Common mistakes to avoid
- Absorbed dose, equivalent dose, and activity describe different radiation quantities and are not interchangeable.
- Do not add meaningful digits beyond the precision of the original measurement.
- Confirm regulated, safety-critical, laboratory, and contractual values against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
What does the Radiation converter do?
Radiation converts absorbed dose, equivalent dose, or radioactivity while preserving the selected radiation quantity. It does not change the physical quantity represented by the input.
What formula does the Radiation converter use?
result = input × 1 ÷ 0.001
Why can a Radiation converter result be rounded?
UnitMora calculates with JavaScript double-precision numbers, then formats the result using your selected decimal or significant-figure setting. The unrounded value may contain more digits than are displayed.
What is the most common radiation conversion mistake?
Absorbed dose, equivalent dose, and activity describe different radiation quantities and are not interchangeable.
Clear answers, without the guesswork
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